Monitoring BGP

We are trying to monitor a BGP session in a SW extreme(X450). We use the command "snmpwalk" to validate the information regarding the OID of BGP, where it informs that there are 5 sessions. When we try to do a "snmpwalk" in a session more specific, it returns an error stating that the OID do not hesitate.Any suggestion? XOS version is 15.2.1.5

Its possible add subtree and use via snmv3? The website bellow show possibles OIDS and respective funcions too, on extreme switch juts works "show snmp get 1.3.6.1.2.1.15.2.0" = local AS and 1.0 BGP version, i created a ticket on TAC but until now anyone reply.

They told me that usually similar problems with this are usually only resolved with external intervention of the development area because the extreme not have these MIBs implemented in software, they closed the ticket on the grounds that other monitoring systems as Rigdline and Netsght work properly.